<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div>
        <video id="localVideo"  autoplay="autoplay"  controls="controls" style="width: 300px;height: 150px;" ></video>
        <video id="remoteVideo"  autoplay="autoplay" controls="controls" style="width: 300px;height: 150px;" ></video>
    </div>
    <div>
        <button id="startBtn" >start</button>
        <button id="callBtn" >call</button>
        <button id="hangupBtn" >hangup</button>
    </div>
</body>
<script src="https://cdnjs.cloudflare.com/ajax/libs/socket.io/2.0.3/socket.io.js"></script>
<script src="./js/chat.js" ></script>
</html>